Multiple Choice
What is simple diffusion?
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6. The Membrane
Simple and Facilitated Diffusion
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Which of the following statements about facilitated diffusion is false?
A
Facilitated diffusion allows molecules to move across the cell membrane.
B
Facilitated diffusion requires a concentration gradient.
C
Facilitated diffusion involves the use of transport proteins.
D
Facilitated diffusion requires energy in the form of ATP.
Verified step by step guidance1
Facilitated diffusion is a type of passive transport, meaning it does not require energy input from the cell. This is a key characteristic that distinguishes it from active transport.
In facilitated diffusion, molecules move across the cell membrane down their concentration gradient, from an area of higher concentration to an area of lower concentration.
Transport proteins, such as channel proteins and carrier proteins, are involved in facilitated diffusion. These proteins help specific molecules or ions to pass through the cell membrane.
The statement 'Facilitated diffusion requires energy in the form of ATP' is false because facilitated diffusion does not require energy. It relies on the natural kinetic energy of molecules moving down their concentration gradient.
To identify the false statement, understand that facilitated diffusion is driven by the concentration gradient and does not involve ATP, unlike active transport which requires energy to move substances against their concentration gradient.
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